\section{Acknowledgments}

We would like to thank Pascal Bourguignon for reading and commenting
on an early draft of this paper.  We would also like to thank Alastair
Bridgewater for helping us with the foreign-function interface of
\sbcl{}.  Finally, we would like to thank Pascal Bourguignon, Alastair
Bridgewater, James Kalenius, Steven Styer, Nicolas Hafner, and Eric
Lind for helping us run benchmarks on platforms that are unavailable
to us.  Finally, we would like to thank Martin Simmons at \lispworks{}
technical support for giving us the information we needed in order to
explain the performance of our technique on the \lispworks{}
\commonlisp{} implementation.
